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improve the remove link area related code in craft_utils.py #111

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improve the remove link area related code in craft_utils.py #111

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20 changes: 17 additions & 3 deletions craft_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,10 +25,15 @@ def getDetBoxes_core(textmap, linkmap, text_threshold, link_threshold, low_text)
""" labeling method """
ret, text_score = cv2.threshold(textmap, low_text, 1, 0)
ret, link_score = cv2.threshold(linkmap, link_threshold, 1, 0)

text_score_comb = np.clip(text_score + link_score, 0, 1)
nLabels, labels, stats, centroids = cv2.connectedComponentsWithStats(text_score_comb.astype(np.uint8), connectivity=4)


### if link_threshold too high do not need remove link area
boxtype = 0 #detect text block
if np.count_nonzero(link_score) == 0:
boxtype = 1 #detect char only

det = []
mapper = []
for k in range(1,nLabels):
Expand All @@ -42,7 +47,16 @@ def getDetBoxes_core(textmap, linkmap, text_threshold, link_threshold, low_text)
# make segmentation map
segmap = np.zeros(textmap.shape, dtype=np.uint8)
segmap[labels==k] = 255
segmap[np.logical_and(link_score==1, text_score==0)] = 0 # remove link area

# detect char only do not need remove link area, detect text block do remove link area by new way to reduce time cost
if boxtype == 0:
#segmap[np.logical_and(link_score==1, text_score==0)] = 0 # remove link area
segmap_sub = segmap[stats[k][1]:stats[k][1]+stats[k][3],stats[k][0]:stats[k][0]+stats[k][2]]
link_score_sub = link_score[stats[k][1]:stats[k][1]+stats[k][3],stats[k][0]:stats[k][0]+stats[k][2]]
text_score_sub = text_score[stats[k][1]:stats[k][1]+stats[k][3],stats[k][0]:stats[k][0]+stats[k][2]]
segmap_sub[np.logical_and(link_score_sub==1, text_score_sub==0)] = 0
segmap[stats[k][1]:stats[k][1]+stats[k][3],stats[k][0]:stats[k][0]+stats[k][2]] = segmap_sub

x, y = stats[k, cv2.CC_STAT_LEFT], stats[k, cv2.CC_STAT_TOP]
w, h = stats[k, cv2.CC_STAT_WIDTH], stats[k, cv2.CC_STAT_HEIGHT]
niter = int(math.sqrt(size * min(w, h) / (w * h)) * 2)
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